Who owns AmperCap Acquisition Co?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of APMCU from SEC Form 13F filings across 43 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 43 institutions disclosed 9.1M shares of AmperCap Acquisition Co worth $91.3M — about 45.7% of shares outstanding; the largest disclosed holder is Magnetar Financial LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
43
13F holders
$91.3M
value, 2026 filers
45.7%
of shares outstanding (9.1M sh)
43
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of APMCU's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Magnetar Financial LLCNEW | 1.2M | $12.0M | 0.1% | 6% | new |
| 2 | Wealthspring Capital LLCNEW | 963,290 | $9.7M | 2.2% | 4.8% | new |
| 3 | GLAZER CAPITAL, LLCNEW | 690,000 | $6.9M | 0.2% | 3.5% | new |
| 4 | AQR Arbitrage LLCNEW | 651,015 | $6.5M | 0.1% | 3.3% | new |
| 5 | First Trust Capital Management L.P.NEW | 630,601 | $6.3M | 0.4% | 3.2% | new |
| 6 | Clear Street Group Inc.NEW | 422,655 | $4.0M | 0.0% | 2.1% | new |
| 7 | Shaolin Capital Management LLCNEW | 405,851 | $4.1M | 0.2% | 2% | new |
| 8 | TUDOR INVESTMENT CORP ET ALNEW | 315,000 | $3.2M | 0.0% | 1.6% | new |
| 9 | RIVERNORTH CAPITAL MANAGEMENT, LLCNEW | 300,000 | $3.0M | 0.1% | 1.5% | new |
| 10 | LMR Partners LLPNEW | 250,000 | $2.5M | 0.0% | 1.3% | new |
| 11 | BERKLEY W R CORPNEW | 247,605 | $2.5M | 0.1% | 1.2% | new |
| 12 | CANTOR FITZGERALD, L. P.NEW | 211,449 | $2.1M | 0.0% | 1.1% | new |
| 13 | TORONTO DOMINION BANKNEW | 200,000 | $2.0M | 0.0% | 1% | new |
| 14 | WHITEBOX ADVISORS LLCNEW | 200,000 | $2.0M | 0.0% | 1% | new |
| 15 | BNP PARIBAS FINANCIAL MARKETSNEW | 198,985 | $2.0M | 0.0% | 1% | new |
| 16 | Periscope Capital Inc.NEW | 175,500 | $1.8M | 0.2% | 0.9% | new |
| 17 | Linden Advisors LPNEW | 175,000 | $1.8M | 0.0% | 0.9% | new |
| 18 | Calamos Advisors LLCNEW | 150,000 | $1.5M | 0.0% | 0.8% | new |
| 19 | ARISTEIA CAPITAL, L.L.C.NEW | 150,000 | $1.5M | 0.0% | 0.8% | new |
| 20 | Radcliffe Capital Management, L.P.NEW | 150,000 | $1.5M | 0.1% | 0.8% | new |
| 21 | Yakira Capital Management, Inc.NEW | 150,000 | $1.5M | 0.4% | 0.8% | new |
| 22 | MOORE CAPITAL MANAGEMENT, LPNEW | 130,000 | $1.3M | 0.0% | 0.7% | new |
| 23 | Westchester Capital Management, LLCNEW | 130,000 | $1.3M | 0.1% | 0.7% | new |
| 24 | Mint Tower Capital Management B.V.NEW | 125,000 | $1.3M | 0.1% | 0.6% | new |
| 25 | GRITSTONE ASSET MANAGEMENT LLCNEW | 124,988 | $1.3M | 1.2% | 0.6% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation. Research, not investment advice.